Chester has been part of our family for about 10 days now. The introduction of the two cats went much better than I anticipated. We took it slow, over a few days.
At first, there was much hissing (good Lord, cat breath stinks even worse when they hiss.)
Then there were suspicious looks, followed by hissing. But at least it was less hissing.
Then, we moved on to general mistrust and butt-sniffing.
Next, came some not-so-gentle whacks to the head from Einstein. He just needed to remind Chester that this was his house, not Chester's.
Finally, we got to the point, about three days ago, where they were sort-of-playing. We supervised this closely, since Einstein is approximately 7 times Chester's size. There were friendly whacks to the head, hiding and pouncing and more butt-sniffing. I decided it was all going well and left them unsupervised while I got ready for school.
I was alarmed when I heard an unusual noise from Chester. It wasn't pain, it wasn't fear, it was more a cry of indignation. And I found Einstein carrying Chester into the house from the back porch by the scruff.
This is where it stands now. They chase each other and wrestle and play. Einstein tolerates Chester attacking his tail and jumping on his back and kicking him in the face...to a point. Then Einie pins Chester down and bites his scruff. Chester meows a few "Hey! Not fair!" kind of meows and Einstein lets him go and he come right back for more.
The way I figure it, Chester probably deserves what he gets.
But, we are well on our way to friendship. Or at least tolerance.